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(7/9-1/3):11/36

=4/9:11/36

=4/9.36/11

x=16/11

\(12371-5428+1429=\left(12371+1429\right)-5428=13800-5428=8372\\ 36,44\times99+36+0,4=36,4\times\left(100-1\right)+\left(36+0,4\right)=36,4\times100-36,4+36,4=3640+0=3640\)

12371 - 5428 + 1429

= {12371 + 1429} - 5428

=  13800 - 5428

=8,372

36,4 * 99 + 36 + 0,4

= 36,4 * 99 + 36,4

= 36,4 * [ 99 + 1 ]

= 36,4 * 100

= 3640

lưu ý đấu * là nhân nhé

Bài 1:
\(\dfrac{36}{21}-\dfrac{15}{20}\)
\(=\dfrac{12}{7}-\dfrac{3}{4}\)
\(=\dfrac{48}{28}-\dfrac{21}{28}\)
\(=\dfrac{27}{28}\)
\(----\)
\(\dfrac{63}{45}-\dfrac{20}{25}\)
\(=\dfrac{63}{45}-\dfrac{4}{5}\)
\(=\dfrac{63}{45}-\dfrac{36}{45}\)
\(=\dfrac{27}{45}=\dfrac{3}{5}\)
Bài 2:
\(\dfrac{3}{5}+\dfrac{3}{16}+\dfrac{13}{16}\)
\(=\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)\)
\(=\dfrac{3}{5}+1\)
\(=\dfrac{3}{5}+\dfrac{5}{5}\)
\(=\dfrac{8}{5}\)

`36/21-15/20`

`=12/7-3/4`

`=48/28-21/28`

`=27/28`

__

`63/45-20/25`

`=7/5-4/5`

`=3/5`

__

`2)`

`3/5+3/16+13/16`

`=3/5+(3/16+13/16)`

`=3/5+16/16`

`=3/5+1`

`=3/5+5/5`

`=8/5`

`#QiN`

35 x 36 + 36 x 63 + 36 : 1/2​

= 35 x 36 + 36 x 63 + 36 x 2

= 36 x ( 35 + 63 + 2 )

= 36 x 100

= 3 600

/HT\

=35x36+36x63+36x2 (nếu bn ko hiểu tại sao mik nhân 2 thì: 36 : 1/2 = 36 x 2/1= 36 x2) =35x(35+63+2) = 35x100=3500

=35 x 36 + 36 x 63 + 36 x 2
=36 x (35 + 63 +2)
=36 x 100
=3600

\(\dfrac{1}{10}+\dfrac{4}{20}+\dfrac{9}{30}+\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}\)
\(=\dfrac{1}{10}+\dfrac{1}{5}+\dfrac{3}{10}+\dfrac{2}{5}+\dfrac{1}{2}+\dfrac{3}{5}+\dfrac{7}{10}+\dfrac{4}{5}+\dfrac{9}{10}\)
\(=\left(\dfrac{1}{10}+\dfrac{3}{10}+\dfrac{7}{10}+\dfrac{9}{10}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}+\dfrac{3}{5}+\dfrac{4}{5}\right)+\dfrac{1}{2}\)
\(=2+2+\dfrac{1}{2}\)
\(=4+\dfrac{1}{2}\)
\(=\dfrac{8}{2}+\dfrac{1}{2}=\dfrac{9}{2}\)

36 x 99 + 36 +0,4

=36 x 99 + 36 x1 +0,4

= 36 x ( 99 + 1 ) + 0,4

= 36 x 100 + 0,4

= 3600 + 0,4

= 3600,4

36×(99+0,4)

36×99,4=35784

\(\)Ta có \(36.99+36+0,4\)

   \(=\left(36.99+36\right)+0,4\)

   \(=\left(36.99+36.1\right)+0,4\)

   \(=36.\left(99+1\right)+0,4\)

   \(=36.100+0,4\)

   \(=3600+0,4\)

   \(=3600,4\)

36 x 47 + 33 x 36 + 9 x 80

= 36 x (47 + 33) + 9 x 80

= 36 x 80 + 9 x 80

= 80 x (36 + 9)

= 80 x 45

=3600

=(5/18+67/18)+(13/51+4/51)+4

=4+1/3+4

=8+1/3

=25/3

giúp mình nhanh với 

(5/18+67/18)+(13/51+4/51)+36/9

=   4           +      1/3         +  4

=  4  *  (1/3 +1 )

= 4 *   1/3

=4/3